When is my implant effective?

Aubrey • 26, married 06/2013, 1st babe born 9/17/2017 💜, 2nd babe born 4/20/2020 💜
I had my Nexplanon put in today but when I was reading about when you should have it inserted they said CD 1-5. I'm on CD 17 and the nurse practitioner put mine in today. Is that going to throw anything off? When will it start being effective?